Add tests against python (WIP)

[spebern]

This is still a WIP, and I'd like to get some feedback on this approach first.

Given that a lot of the functionality is available in Python and widely tested, I think it would make sense to test against Python. This can save a lot of time in generating/writing test code, and we profit from the widely tested Python libraries.

Currently, I only added one test for the reverse bessel roots and limited the n because for higher n the try_n_roots was returning an error.

If Python is not available, the test function does not get called, any error on importing SciPy will be ignored, and the test gets skipped.

What do you think about this approach? One disadvantage is that python with SciPy is required for those tests, but I think it makes writing tests so trivial that it is worth introducing it.

[PanieriLorenzo]

I think it's a good approach, since I'm loosely basing this crate on NumPy and SciPy. I don't have any issues with the python dev dependency as I'm quite comfortable with python.

I haven't run it yet because I'll be quite busy for a few days but I'll run it when I have time and tell you if there's any issue.

[PanieriLorenzo]

I tried running it but it cannot find libpython3.11.so.1.0, I cannot seem to find why it is dependent on 3.11 specifically, because I only have 3.12 and 3.10 installed system-wide. Could you maybe make it more portable, perhaps with a virtual environment? Or add instructions on what dependencies are needed. I tried building within a 3.11 virtualenv with no luck